Update the signature key for phpcbf

Fixes #533

Enable php-cs-fixer on PHP 8.4

The latest pest version assumes it is installed in the project and expects the tests directory to be present. It is impossible to run it as an external tool anymore.

Example failure when trying to use pest installed with the composer-bin plugin:

 Pest\Exceptions\FatalException

  The test directory [/home/runner/work/toolbox/toolbox/build/tools/.composer/vendor-bin/pest/tests/] does not exist.

  at build/tools/.composer/vendor-bin/pest/vendor/pestphp/pest/src/Bootstrappers/BootFiles.php:45
     41▕         $rootPath = TestSuite::getInstance()->rootPath;
     42▕         $testsPath = $rootPath.DIRECTORY_SEPARATOR.testDirectory();
     43▕
     44▕         if (! is_dir($testsPath)) {
  ➜  45▕             throw new FatalException(sprintf('The test directory [%s] does not exist.', $testsPath));
     46▕         }
     47▕
     48▕         foreach (self::STRUCTURE as $filename) {
     49▕             $filename = sprintf('%s%s%s', $testsPath, DIRECTORY_SEPARATOR, $filename);

Remove pest

… supported

Change the test command for lines since the previous one is no longer…

Update the yaml-lint signature

Re-enable php-semver-checker

Enable PHPSpec on PHP 8.4

…available